fix cocosbuilder create particle error

Author: kpkhxlgy0

cocos2d/particle/CCParticleSystem.js

@@ -364,8 +364,8 @@ cc.ParticleSystem = cc.Node.extend(/** @lends cc.ParticleSystem# */{
             this._quadsArrayBuffer = null;
         }
 
-        if (typeof(plistFile) === "number") {
-            var ton = plistFile;
+        if (!plistFile || typeof(plistFile) === "number") {
+            var ton = plistFile || 100;
             this.setDrawMode(cc.ParticleSystem.TEXTURE_MODE);
             this.initWithTotalParticles(ton);
         } else if (plistFile) {
@@ -2824,4 +2824,4 @@ cc.ParticleSystem.TYPE_RELATIVE = 1;
  * @constant
  * @type Number
  */
-cc.ParticleSystem.TYPE_GROUPED = 2;
+cc.ParticleSystem.TYPE_GROUPED = 2;